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Forgery of Provable Secure Short Signcryption Scheme
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/09/01
Online ISSN: 1745-1337
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Information Theory and Its Applications)
Full Text: PDF(62KB)>>
In this paper, we analyse Ma signcryption scheme  proposed in Inscrypt'2006. Although Ma signcryption scheme  is probably secure against adaptive chosen ciphertext attacks and forgery, we show that Ma signcryption scheme is easily forgeable by the receiver and the receiver can impersonate the sender to forge any valid signcryption to any receiver.